This was posted as a comment on the Fleets and Ships Overview article. I think it deserves its own spot…
There is no perfect army.
It depends on how are you going to use it what ships are you going to useÖ For example, if you are going to do fleetcrash, I think the best combination will be battle ships, plus cruisers as cannon fodder.
I donít consider useful to use light fighters in this case because of the rapidfire, and the destroyers are a bit slow, so it would be easy to fleetsave before the attack. But, this isnít always like this.
Destroyers can be useful, if you have a tactic to solve the problem of the speed, for example, with a mobile base.
In the other hand, if your objective is to farm, I would use light fighters as cannon fodder, because of its cost, and there is no need to worry about the rapid fire. An also, the bombers are useful in this case. But, maybe you want to do a lot of farming per day, and that means that youíll need speed. There, the cruisers come very useful.
As I said before, I think (Maybe iím wrong) that there is no perfect fleet, it depends of a lot of factors, like your objective, your way to play the game (If you like to attack players without defenses, maybe the best ship for you may be the espionage probe :P)
The thing is to figure out what do you need, in base of the situation.